Phenomena Involving Neutron Capture by Selected Cobalt Complexes [1]

Abstract

The identification of radiolabeled degradation products and other phenomena involving the neutron irradiation of five different cobalt complexes is reported. Solvent and pu effects upon degradation product distribution in solution are noted. Electrophoretic and chromatographic analysis correlation for radiolabeled decomposition products is discussed. Results of studies involving mass spectrometry, magnetic susceptibility, X-ray diffraction, and infra-red spectroscopy are also reported. The conclusion is drawn that there is an even larger number of factors affecting degradation product distribution for neutron-irradiated cobalt complexes than previously known. ZusammenfassungEs wird von der Erkennung von radiomarkierten Abbauprodukten und anderen Erscheinungen, die die NeutronBestrahlung von fünf verschiedenen Kobaltkomplexen betrifft, hier berichtet. Lösungsmittel-und pn-Wirkungen auf Abbauprodukt-Verteilung in Lösung werden beschrieben. Elektrophoretische und chromatographische Analysenwechselbeziehung von radiomarkierten Abbauprodukten wird besprochen. Es wird auch über Resultate in Massen-Spektroskopie, Magnetisierbarkeit, Röntgenstrahlendiffraktion und infraroter Spektroskopie berichtet. Man kommt zum Schluß, daß sogar eine noch größere Zahl von Umständen besteht, die die Verteilung von Abbauprodukten von neutronbestrahlten Kobaltkomplexen betrifft, als vorher bekannt war. RésuméOn rendre compte sur l'identification des produits de dégra-dation radiomarqués et des autres phénomènes entraînant l'irradiation de neutron de cinque complexes differente de cobalt. Les effets du solvant et ps sur la distribution des produits de dégradation en solution sont aussi constatés. La correlation de l'analyse électrophorétique et chromatographique pour produits de dégradation radiomarqués est aussi discuté. Les résultats des études concernant spectrometrie en masse, susceptibilité magnétique, diffraction radiologique et spectroscopie infra-rouge sont aussi rapportés. La déduction est tirée que même un nombre plus grand existe des facteurs touchant la distribution des produits de dégradation qu'on a su préalablement.

Radiochemical effects of thermal neutron capture in Cr(tmhd)3: method development

“…It is also in accordance with a hypothesis formulated by Harbottle [5], that [radioactive] recoil fragments might be so unstable that they do not distinguish between different solvents upon dissolution. Stucky and Kieser [33], on the other hand, did observe differences in the "retention" values for some of the compounds they investigated depending on the type of solvent used, so the above statement may not be generally true. A difference in the respective distribution of 51 Cr activity along the NP-TLC plates is also evident for samples R1 and R2 in Fig.…”

“…9 If (prolonged) solvent exposure encourages reactions of radioactive species back to Cr(tmhd) 3 , this may be a possible explanation for the slightly different results of the gamma-spectrometric method compared to the radio-TLC method in terms of the amount of the 51 Cr activity in the original chemical form. Also, exposure to different solvents has already been raised as an influencing factor in "hot-atom chemistry" [33].…”

Annealing of Recoil Effects in Co(IIΙ) Complexes: A New Hypothesis on the Role of Ambient Gases

“…However, electrophoretic work in several complexes reveals a number of other products in addition to these two species [28,29]. SHANKAR and SHANKER [24] have found that pu of dissolution has a profound effect on product distribution in NaCo(III)EDTA.…”

Comment on "Phenomena Involving Neutron Capture by Selected Cobalt Complexes“

“…In their recent publication, STUCKY and KISER [1] have concluded that neutron irradiation of a few cobalt complexes results in the production of a number of degradation products. From their magnetic susceptibility measurements (increase in the case of four of the irradiated complexes and decrease in the case of cobalt(II) glycinate as compared to the unirradiated complexes) they conclude that at least in the case of the cobalt(II) glycinate the decomposition products are almost certainly not simple radiocobaltous species of high spin.…”